<template>
  <div class="full-calendar-body">
    <div class="weeks">
      <strong class="week" v-for="(week,index1) in weekNames" :key="index1">{{week}}</strong>
    </div>
    <div class="dates" ref="dates">
      <div class="dates-bg">
        <div class="week-row" v-for="(week,index2) in currentDates"  :key="index2">
          <div class="day-cell" v-for="(day,index3) in week" :key="index3"
            :class="{'today' : day.isToday,
              'not-cur-month' : !day.isCurMonth}">
            <p class="day-number">{{day.monthDay}}</p>
          </div>
        </div>
      </div>

      <!-- absolute so we can make dynamic td -->
      <div class="dates-events">
        <div class="events-week" v-for="(week,index1) in currentDates" :key="index1">
          <div class="events-day" v-for="(day,index2) in week" track-by="$index" :key="index2"
            :class="{'today' : day.isToday,
              'not-cur-month' : !day.isCurMonth}" @click.stop="dayClick(day.date, $event)">
            <p class="day-number">{{day.monthDay}}</p>
            <div class="event-box">
              <p class="event-item" v-for="(event, index3) in day.events" :key="index3" v-show="event.cellIndex <= eventLimit"
                 :class="[classNames(event.cssClass), {
                  'is-start'   : isStart(event.start, day.date),
                  'is-end'     : isEnd(event.end,day.date),
                  'is-opacity' : !event.isShow
                  }]"
                @click="eventClick(event,$event)">
                {{isBegin(event, day.date, day.weekDay)}}
              </p>
              <p v-if="day.events.length > eventLimit"
                class="more-link" @click.stop="selectThisDay(day, $event)">
                + {{day.events[day.events.length -1].cellIndex - eventLimit}} more
              </p>
            </div>
          </div>
        </div>
      </div>

      <!-- full events when click show more -->
      <div class="more-events" v-show="showMore"
        :style="{left: morePos.left + 'px', top: morePos.top + 'px'}">
        <div class="more-header">
          <span class="title">{{moreTitle(selectDay.date)}}</span>
          <span class="close" @click.stop="showMore = false">x</span>
        </div>
        <div class="more-body">
          <ul class="body-list">
            <li v-for="(event, index1) in selectDay.events" :key="index1"
              v-show="event.isShow" class="body-item"
              @click="eventClick(event,$event)">
              {{event.title}}
            </li>
          </ul>
        </div>
      </div>

      <slot name="body-card">

      </slot>

    </div>
  </div>
</template>
<script type="text/babel">
import dateFunc from './dateFunc'

export default {
  props: {
    currentDate: {},
    events: {},
    weekNames: {
      type: Array,
      default: () => {}
    },
    monthNames: {},
    firstDay: {}
  },
  created () {
    this.events.forEach((item, index) => {
      item._id = item.id || index
      item.end = item.end || item.start
    })
    // this.events = events
  },
  data () {
    return {
      // weekNames : DAY_NAMES,
      weekMask: [1, 2, 3, 4, 5, 6, 7],
      // events : [],
      isLismit: true,
      eventLimit: 3,
      showMore: false,
      morePos: {
        top: 0,
        left: 0
      },
      selectDay: {}
    }
  },
  watch: {
    weekNames (val) {
      console.log('watch weekNames', val)
    }
  },
  computed: {
    currentDates () {
      return this.getCalendar()
    }
  },
  methods: {
    isBegin (event, date, index) {
      let st = new Date(event.start)

      if (index === 0 || st.toDateString() === date.toDateString()) {
        return event.title
      }
      return '　'
    },
    moreTitle (date) {
      let dt = new Date(date)
      return this.weekNames[dt.getDay()] + ', ' + this.monthNames[dt.getMonth()] + dt.getDate()
    },
    classNames (cssClass) {
      if (!cssClass) return ''
      // string
      if (typeof cssClass === 'string') return cssClass

      // Array
      if (Array.isArray(cssClass)) return cssClass.join(' ')
      // else
      return ''
    },
    getCalendar () {
      // calculate 2d-array of each month
      // first day of this month
      let now = new Date() // today
      let current = new Date(this.currentDate)

      let startDate = dateFunc.getStartDate(current) // 1st day of this month

      let curWeekDay = startDate.getDay()

      // begin date of this table may be some day of last month
      let diff = parseInt(this.firstDay) - curWeekDay
      diff = diff > 0 ? (diff - 7) : diff

      startDate.setDate(startDate.getDate() + diff)
      let calendar = []

      for (let perWeek = 0; perWeek < 6; perWeek++) {
        let week = []
        for (let perDay = 0; perDay < 7; perDay++) {
          week.push({
            monthDay: startDate.getDate(),
            isToday: now.toDateString() === startDate.toDateString(),
            isCurMonth: startDate.getMonth() === current.getMonth(),
            weekDay: perDay,
            date: new Date(startDate),
            events: this.slotEvents(startDate)
          })

          startDate.setDate(startDate.getDate() + 1)
          // if (startDate.toDateString() == endDate.toDateString()) {
          //   isFinal = true
          //   break
          // }
        }
        calendar.push(week)
        // if (isFinal) break
      }
      return calendar
    },
    slotEvents (date) {
      // find all events start from this date
      // let cellIndexArr = []
      let thisDayEvents = this.events.filter(day => {
        let dt = new Date(day.start)
        let st = new Date(dt.getFullYear(), dt.getMonth(), dt.getDate())
        let ed = day.end ? new Date(day.end) : st
        // console.log('slotEvt', st, ed, date)
        return date >= st && date <= ed
      })

      // sort by duration
      thisDayEvents.sort((a, b) => {
        if (!a.cellIndex) return 1
        if (!b.cellIndex) return -1
        return a.cellIndex - b.cellIndex
      })

      // mark cellIndex and place holder
      for (let i = 0; i < thisDayEvents.length; i++) {
        thisDayEvents[i].cellIndex = thisDayEvents[i].cellIndex || (i + 1)
        thisDayEvents[i].isShow = true
        if (thisDayEvents[i].cellIndex === i + 1 || i > 2) continue
        thisDayEvents.splice(i, 0, {
          title: 'holder',
          cellIndex: i + 1,
          start: dateFunc.format(date, 'yyyy-MM-dd'),
          end: dateFunc.format(date, 'yyyy-MM-dd'),
          isShow: false
        })
      }

      return thisDayEvents
    },
    isStart (eventDate, date) {
      let st = new Date(eventDate)
      return st.toDateString() === date.toDateString()
    },
    isEnd (eventDate, date) {
      let ed = new Date(eventDate)
      return ed.toDateString() === date.toDateString()
    },
    selectThisDay (day, jsEvent) {
      this.selectDay = day
      this.showMore = true
      this.morePos = this.computePos(event.target)
      this.morePos.top -= 100
      let events = day.events.filter(item => {
        return item.isShow === true
      })
      this.$emit('moreclick', day.date, events, jsEvent)
    },
    computePos (target) {
      let eventRect = target.getBoundingClientRect()
      let pageRect = this.$refs.dates.getBoundingClientRect()
      return {
        left: eventRect.left - pageRect.left,
        top: eventRect.top + eventRect.height - pageRect.top
      }
    },
    dayClick (day, jsEvent) {
      this.$emit('dayclick', day, jsEvent)
    },
    eventClick (event, jsEvent) {
      if (!event.isShow) {
        return
      }
      jsEvent.stopPropagation()
      let pos = this.computePos(jsEvent.target)
      this.$emit('eventclick', event, jsEvent, pos)
    }
  }
}
</script>
<style lang="scss">
.full-calendar-body{
  margin-top: 20px;
  .weeks{
    display: flex;
    border-top:1px solid #e0e0e0;
    border-bottom:1px solid #e0e0e0;
    border-left:1px solid #e0e0e0;
    .week{
      flex:1;
      text-align: center;
      border-right:1px solid #e0e0e0;
    }
  }
  .dates {
    position:relative;
    .week-row{
      // width: 100%;
      // position:absolute;
      border-left:1px solid #e0e0e0;
      display: flex;
      .day-cell{
        flex:1;
        // min-height: 100px;
        min-height: 50px;
        padding:4px;
        border-right:1px solid #e0e0e0;
        border-bottom:1px solid #e0e0e0;
        .day-number{
          text-align: right;
        }
        &.today{
          background-color:#fcf8e3;
        }
        &.not-cur-month{
          .day-number{
            color:rgba(0,0,0,.24);
          }
        }
      }
    }
    .dates-events{
      position:absolute;
      top:0;
      left:0;
      z-index:1;
      width: 100%;
      .events-week{
        display: flex;
        .events-day{
          cursor: pointer;
          flex:1;
          // min-height: 109px;
          min-height: 59px;
          overflow: hidden;
          text-overflow: ellipsis;
          .day-number{
            text-align: right;
            padding:4px 5px 4px 4px;
            opacity: 0;
          }
          &.not-cur-month{
            .day-number{
              color:rgba(0,0,0,.24);
            }
          }
          .event-box{
            .event-item{
              cursor: pointer;
              font-size:12px;
              background-color:#C7E6FD;
              margin-bottom:2px;
              color: rgba(0,0,0,.87);
              padding:0 0 0 4px;
              height: 18px;
              line-height: 18px;
              white-space: nowrap;
              overflow: hidden;
              text-overflow: ellipsis;
              &.is-start{
                margin-left: 4px;
                // border-top-left-radius:4px;
                // border-bottom-left-radius:4px;
              }
              &.is-end{
                margin-right: 4px;
                // border-top-right-radius:4px;
                // border-bottom-right-radius:4px;
              }
              &.is-opacity{
                opacity: 0;
              }
            }
            .more-link{
              cursor: pointer;
              // text-align: right;
              padding-left: 8px;
              padding-right: 2px;
              color: rgba(0,0,0,.38);
              font-size: 14px;
            }
          }
        }
      }
    }
    .more-events{
      position:absolute;
      width: 150px;
      z-index: 2;
      border:1px solid #eee;
      box-shadow: 0 2px 6px rgba(0,0,0,.15);
      .more-header{
        background-color:#eee;
        padding:5px;
        display: flex;
        align-items : center;
        font-size: 14px;
        .title{
          flex:1;
        }
        .close{
          margin-right: 2px;
          cursor: pointer;
          font-size: 16px;
        }
      }
      .more-body{
        height: 140px;
        overflow: hidden;
        .body-list{
          height: 120px;
          padding:5px;
          overflow: auto;
          background-color:#fff;
          .body-item{
            cursor: pointer;
            font-size:12px;
            background-color:#C7E6FD;
            margin-bottom:2px;
            color: rgba(0,0,0,.87);
            padding:0 0 0 4px;
            height: 18px;
            line-height: 18px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
          }
        }
      }
    }
  }
}
</style>
